//go:build darwin

package installer

import (
	"fmt"
	"image/png"
	"os"
	"os/exec"
	"path/filepath"
	"testing"

	"gitgud.io/mike/mpv-manager/internal/assets"
	"github.com/stretchr/testify/require"
)

func TestNativeMacIconConversion(t *testing.T) {
	root := t.TempDir()
	pngData, err := assets.ReadPNGIcon()
	if err != nil {
		t.Fatal(err)
	}
	input, output := filepath.Join(root, "icon.png"), filepath.Join(root, "icon.icns")
	if err := os.WriteFile(input, pngData, 0600); err != nil {
		t.Fatal(err)
	}
	if err := ConvertPNGToICNS(input, output); err != nil {
		t.Fatalf("native macOS icon conversion failed: %v", err)
	}
	decoded := filepath.Join(root, "decoded.iconset")
	diagnostic, err := exec.Command("iconutil", "-c", "iconset", "-o", decoded, output).CombinedOutput()
	require.NoError(t, err, string(diagnostic))
	for _, size := range []int{16, 32, 128, 256, 512} {
		for _, scale := range []int{1, 2} {
			name := fmt.Sprintf("icon_%dx%d", size, size)
			if scale == 2 {
				name += "@2x"
			}
			file, err := os.Open(filepath.Join(decoded, name+".png"))
			require.NoError(t, err)
			dimensions, err := png.DecodeConfig(file)
			require.NoError(t, err)
			require.NoError(t, file.Close())
			require.Equal(t, size*scale, dimensions.Width)
			require.Equal(t, size*scale, dimensions.Height)
		}
	}
}